Dirichletia obovata

About

Dirichletia obovata, synonym Carphalea obovata, is a species of plant in the family Rubiaceae. It is a shrub endemic to Socotra. It has small pink or lilac flowers, and has a distinctive asymmetric wing-like calyx which gradually expands to hide the developing fruit. It is locally common in montane woodland and along wadis at lower elevations, from 100–1,100 metres elevation.

Summary from Wikipedia